Sebastian Vettel admits that he will need to have his wits about him if the weather continues to be changeable at Spa-Francorchamps on race day, but knows he can trust his team to make the right calls.The world champion missed out on pole position as Lewis Hamilton held the last lap trump card on a drying circuit, but topped both Friday and Saturday practice as Red Bull appeared to have the best car and heads into Sunday's race confident of extending his championship lead with a fifth win of the season.However, as qualifying showed, the unpredictable conditions can lead to unpredictable results – witness both Caterham and Marussia getting drivers through to Q2 at Spa – and Vettel...
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